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We will make a listing determination for the black mudalia, a small species of aquatic snail, under the Endangered Species Act. We are required to designate critical habitat, to the maximum extent prudent and determinable, concurrent with a listing determination for the species; we will develop a critical habitat designation for the black mudalia as a separate rulemaking action (RIN 1018-BA59). The black mudalia occurs in shoals and riffles, clinging to gravel, cobble, boulders, or logs, and is found in Jefferson and Blount Counties, Alabama.